body{
 background-color: #CCCACA;    
}
#iframe{
    width: 100%;
    height: 100%;
    background-color: #CCCACA;  
}
#div_iframe{
    width: 100%;
    height: 600px;
    margin-top: 20px;
}
#menu{
    background-color: black;
    height: 50px;
}
#img_casa{
    height: 50px;
    width: 50px;
    float: right;
}
.botones{
    height: 40px;
    margin-top: 5px;
    margin-left: 5px;
}